In article <4a1ec07c.1030...@wixtoolset.org>,
    Rob Mensching <r...@wixtoolset.org>  writes:

> You can't "just check for Cancel". You need to send a message and if a 
> cancel occurred then you'll get that in the return code from 
> ::MsiProcessMessage(). wcautil.lib also has wrappers around many of the 
> MSI functions since more functions than you'd expect can return cancel.

This comes up often enough that it would be a good thing to document
the canonical list of functions that you have to check.  AFAIK, there
is nothing in the Windows Installer documentation that is a list of
such functions, you have to read through each one in the reference.
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